<?php
use Microsoft\Graph\GraphServiceClient;
use Microsoft\Graph\Generated\Users\Item\Settings\Windows\WindowsRequestBuilderGetRequestConfiguration;
$graphServiceClient = new GraphServiceClient($tokenRequestContext, $scopes);
$requestConfiguration = new WindowsRequestBuilderGetRequestConfiguration();
$queryParameters = WindowsRequestBuilderGetRequestConfiguration::createQueryParameters();
$queryParameters->filter = "settingType eq 'backup'";
$requestConfiguration->queryParameters = $queryParameters;
$result = $graphServiceClient->me()->settings()->windows()->get($requestConfiguration)->wait();